While Solyndra LLC’s flameout has fueled criticism of federal initiatives to encourage alternative power sources, the solar-panel maker is hardly the only disappointment among U.S.-backed energy programs.

That’s evident in California, which was awarded $4.6 billion by the Energy Department as part of the 2009 Recovery Act—far more than any other state—to fund programs in energy efficiency and other areas.

A program to install insulation and other energy-saving improvements in homes that received $185.8 million has been hobbled by delays, and a plan to remodel buildings to be more energy-efficient, which received $113 million, has struggled to persuade enough home and building owners to upgrade, according to California officials.

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